I cannot believe some of the posts I have read on this forum regarding running after knee replacement. Why not run? If you enjoy running, if it is important to you, then screw the doctors and run. Google Dick Bearsdley's blog and see what a former world class marathoner says about running on an artificial knee. He's doing 50 to 70 miles a week on a fake knee with absolutley no problems. The materials used today in artificial joints are probably more durable than real bones and cartilage. In my orthopedic surgeon’s brochure, he includes testimonials from patients who have resumed playing tennis and basketball after knee replacement. How are those activities less stressful on the knee than running? If anything they are MORE stressful. So my replacement lasts 15 years instead of 20…big deal. I’m going to run like never before and I don’t give a flying flapjack what the doctor says.